Collapsible core



J. F" WALLACE May 15,1923.

GOLLAPS IBLE CORE Filed Jan. 7, 1922 2 Sheets-Sheet l W//VESSES bf. 32M aff/4%@ A TTOHNEVS May w, 1923.

J. F. WALLACE COLLAPS IBLE CORE 2 vsmaetfs-sheet 2 Filed Jan. 7, 1922 Arron/frs Patented May 15, 1923.

JAMES F.iWALLACE, OF BROOKLYN, NEW YORK.

ooLLAPsrBLn conn.

Application filed January 7, 1922. Serial No. 527,600.

T all eli/wm t may concern.'

Bc it known that I, JAMES F. lVALLaoE, a citizen of the United States, and a resident of the city of New York, borough of Brooklyngin the county of Kings and State of Vuse of electric wires or other similar uses.

A still further object, more specifically, is to provide a collapsible core in ywhich two or more hinged parts are provided and constructed in a' round formation ordinarily but so formed as to be readily constricted for permitting removal whenever desired.

`AIn the accompanying drawings- Figure 1 is a side View of a number of cores arranged in place ready for casting a nest of conduits.

Figure 2 is a sectional view through Figurely approximately on line 2-2.

Figure 3 is a detail perspective view of a clamp embodying `certain features of the invention. Figure 4 is a longitudinal vertical section through' Figure 1 on line i-4, the same showing part of two cores, said cores embodying the invention.

Figure 5 is a sectional view through Figure 4 approximately on line 5 5.

Figure 6 is a view similar to Figure 5 but showing a core constricted or collapsed.

In forming conduits for electric wires, various means have been provided, as for instance, metallic' pipes, terra cotta s'trud tures and concrete. The concrete is considered a very desirable structure but is sometimes difficult to cast properly and present a smooth opening for'the wires. Heretofore, diiferent means including a paper core has been used in casting either single or nestedv conduits. These cores must be removed after the casting has set completely or partially. In the removal of the paper cores much difficulty has been erperienced and in order to overcomethis difculty, the present structure has been provided.l

The detail construction of the core illustrated in Figure 1 has been shown in a general manner inv Figures 4 to 6 inclusive. Referring to these iguresby numerals, 1 indicates a central rod of any desired material, as for instance, wood which is provided with a pin 2 heldin place by ysuitable lock nuts 3 and 4 and acting as a stop for liniiting the movement of rod 1 in one vdirection asthe pin will strike against the core body 5. This core body is shown as made into three parts or sections 6, 7 and 8 and connected by hinges 9 and 10. It will be evident that more or even less sections could be provided if desired. The hinges 9 and 10'eX- tend for the full length of the core bodyy 5 with the exception of a` few inches at the end 11 which is slightly tapered so as to enter into the end 12 of the neXtsection.v

' It will be understood that each section of core is identical. Sometimes itis Adesirable tor have a slight overlap'as shown in Figure 4 though this is not essential and, therefore, the bevel section llcould be dispensed with. Sections 6.and 8 are'provided with longitudinal hookmembers 13 and 14 instead of hinge structures whereby the retaining memberor Yclamp 15 may be slipped thereover as indicated in Figures 4 and 5 whereby the parts are held in proper position so that the core body 5 ywill present a complete round structure in cross section. The core body 5 may be made of any desired material but preferably of metal withthe outer surface formed as smooth as' possible. `Uien the clamp 15 is in the position shownf'in Figurek 5, the core is ready foruse and after it has been used and it is desired to remove the same, rod 1 is grasped and pulled longitudinally whereupon the sections will assume the position shown in Figure 6,.A

namely', a constricted or folded position. v

This constriction or folded action is caused by the various cam members 16 acting on the brackets 17. These brackets are 'welded or otherwise rigidly secured to the core body y could providedif desired-` Also, if desired,` the mounting 4of thecams loin the rod 1 might be loose so as tol allow a pivotalv action. In case lia large collapsing .is desired, each of the hinges 9 and is pijovided With a vpintle 19 having 'a head 2O vWhereby these pintles may be removed in case any one of the sections y'should fa-il' to eave lthe rconcrete when the collapsing action was attempted.

using the CQreLitAviSQ-inte'nded that the foute'r 'surface shall be greased or oiled( each time before useso'that the concrete'will'not adhere thereto. Y y A. /C i y Whenusing 'the core to build a nested conduit, a trench 21 is provided as shown in Figure 2 land in this trench a numberI of supi 'ports'or posts '22 is set, said posts being preferably of concrete 'provided withy notches 23*"fo'rfreceiving the vaifious core bodies `5.

After the parts are :arranged as shownin Figure 2,1 the concrete poured intotlie space around the post '22u13 yt0 a-Ppr'O'Xl- 'inately'liiefe This concrete Will-naturally pass around allof'lthe cores andfforin -agsolid body With the cores-"arranged therein. kAfter the concrete has set to a, certain eXtentTthe cores are collapsed by pulling. therods l l`and then ,are carefully `removeds'o asnot todisturb "the smooth f even surface of; the conduit. In case lthe core does not lcollapseA/readlily., ,the ro'd llmay'be shaken lor movedfb'ackand forth quickly so as to give a jerking action, yivhiclr'a/ction will operate ateachlend ofthe Core body by,y reason ofthe cams v16 and brackets 17. vAs soon as the cores'hfavefbee-n tamed, they may, @enneagram-oiled. @ha

again: placed in ,position for another section to that salreadyfeast.' tm/eration fis continued until the conduits are as long as desired.- Y,

, n vwill* te netta einem sctnalqpefatieh ofcaddinganothery section to theconduit is commenced 'as' soonfas the-cores 4have been "removedwhich is only a-few minutesafter first casting;y In this tvay, a substantially continuous casting operation may be carried out'Which cannot be done with vthe paper cores heretofore used aiidcertainother devices., `The invention has been particularly described in respect to forming"conduits7 but it Willlbe evident that not only conduits may be vformedbyltlie class ofc'ore :described .butialso ducts,arfches, chimneys, flues., aqueductsfhollotv Ycastingsr o'r the formation of hollow "spaces in walls, buildings or other structuresv asl vvell as hollovvplaces infroofs Whai @init isa.

,-1. A collapsible coie ofthe character scribedcomprisin'g a eo'refffbod l a rplurality of sections,*said eoiie body being circula'rvin cross section, saidfsections being ing for drawingk inwardlyandxtoa certain extent saidsectionswhereby ,they -'maybe removed lfrom a castboldyofl conerete.' l

2. A collapsible core'oftheoharaotei; dev scribed comprising a tubular body divided] into longitudinal sections, two of said sections having longitudin*ally4 varrangedv linturned hook edges, said sections yviththefljemovable sections beingfhinged togethei'ivith longitudinally positioned hi'ngesTa clamping member s1g anningr said .inturned :hookfedges and extending into the hookesdpantstlierebf, said clamping memberfbeing f slid'abla intro and out of engagement yvith saidllfOlolfinembers,l vand means operable onependpf the wie body A for CoiiassitgA sani *Stencils after said clamp has'b'e'en removed,

s. A 'Collapsible Core y,or the @inmate 2iscribed comprisin a tubiilai; coregbodydivided into longitudinal sections): sections, being vhinged together fbydoljgitudinally positioned hinges, saidjfsections 'atjany point of connection being disengageablea bracket secured to each of said;Se.Cl0nS.,-"'a

lcam co-acting with said brackfetiforfipiilling saidA bracket and section inwardly andfpushing the same outwardly, and vmeans operable yfromthe end ofthe y'core body foractuating said cams. i Y f Y scribed comprising a tubiilarcorellbodydivided intov longitudina v, sections together, a bracket secured toeach of sa'd sections adjacent eachsend thereof. ajim'llcof acting Withmeach of saidbraeketsj, saidfcamsV I being operable.longitudinallypof .thecore I body and capable of moving saidfse'c'ti, s inwardly and outvvardly,j and a rod connected With said cams andiextendingtoone en dof the core body, said rod being capablev of.

tending the` core body. i

manual operation for collapsing anddis- 5.v A collapsible core co: v body div-idedinto longitudinal sections,said

sections `being connected by hingemembers, j each of said hinge ymembers `zbeing formed vWith a Aremovable pintle Whereby'the core body may be collapsed theremoval Offene pintle or the removal of allthegpin'tles and means for collapsing said sections.v 

